The Kirkholt Burglary Prevention Project

A distance measuring device for use in measuring distances on different scale maps, including an input wheel for following a path to be measured along the map, coupled to and driving an output indicator including an output readout register showing the total path length, in which the driving relationship between the input wheel and the output readout register can be varied by adjusting an intermediate scale wheel. A preferred distance measuring device includes a secondary scale means whereby the rate of speed along the path may be entered into the device and may be constantly varied, and a secondary output indicator which indicates the time for traveling the given distance at the entered rates of speeds.